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I am trying to derive the relation between magnetic field strength in materials and magnetizing field from the [tex]$\mathbf B$[/tex] field. More exactly, my question is:

how do we get this expression

[tex]

$\nabla \centerdot \mathbf H = - \nabla \centerdot \mathbf M$ \\

[/tex]

knowing

[tex]

$\nabla \centerdot \mathbf B = 0$ \\

[/tex]

and

[tex]

$\mathbf B=\mu_0(\mathbf H + \mathbf M )$

[/tex]

?

Anyone can guid me how the first equation is related to the 2nd and 3rd equations?

thanku

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# Magnetic field in materials

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